**Product Description** **Density Measurement Range:** 1.000 - 1.070 SG (Minimum Scale: 0.001) **Concentration Measuring Range:** 0 - 100 C (Minimum Scale: 1 C) **Salinity Measuring Range:** 0 - 10% (Graduation: 0.2%) **Accuracy:** 0.2% **Automatic Temperature Compensation (ATC):** 0 - 10 C **Reference Temperature:** 20 C **Precision Measurement:** This refractometer features a sharp blue-white dividing line for excellent readability, even in daylight. The adjustable eyepiece allows for precise focus adjustment, ensuring accurate readings every time. **Material and Application:** Engineered for testing the concentration of saltwater and saline solutions, this refractometer is ideal for aquariums, marine surveillance, aquaculture (including fish, shrimp, crab, and coral), and quality control in research and clinical laboratories. **User-Friendly Design:** To use, simply place 2-3 drops of your sample on the main prism, close the plate, and look through the viewing window to easily read the salinity value. This straightforward process makes it accessible for both professionals and hobbyists. **Durable Construction:** Constructed with a chrome-plated brass body, this refractometer is resistant to chemical corrosion and wear, significantly extending its lifespan compared to aluminum models. **Measuring Range Summary:** - **Salinity:** 0 - 10% - **Density:** 1.000 - 1.070 SG - **Accuracy:** Salinity +/- 1%, Density +/- 0.001 SG - **Overall Accuracy:** 0.2% This refractometer is an essential tool for anyone involved in marine biology, aquaculture, or laboratory research, providing reliable and precise measurements for all your salinity and density testing needs.